How Plastic Injection Molding Works

Posted By: Tony | Date: 29-12-2015

Plastic injection molding is used for a wide range of applications. For example, parts made through this process are used within the automotive industry, parts are a key part of certain musical instruments, video game consoles, furniture, storage containers, packaging, bottle caps, and the list goes on.

Regardless of what the parts will be used for, it is imperative to choose a reputable company to handle any plastic injection molding need. This is why so many people turn to Offshore Direct Metals. In addition to an incredible talented team of professionals, this company is able to save customers money by using material suppliers from around the world.

As part of the plastic injection molding process, a ram or screw like plunger is used to force melted plastic into a mold cavity. Once the plastic has cooled, it retains the exact shape or configuration of the mold. Most often, thermosetting polymers and thermoplastic is used. While there are similarities there are also differences.

For example, as far as the volume of material processed on an annual basis, thermosetting polymer is more common although thermoplastics are in high demand because of the unique characteristics. Based on these characteristics, thermoplastics are an excellent material for the plastic injection molding process. Because this material is highly versatile, it can be used in a wide range of applications.

Another benefit of thermoplastics is that once heated, they soften and flow with ease. In addition, this material is a much safer option when compared to thermosetting polymer. As an example, if thermosetting polymer does not eject from the barrel at the right time, check valves and the screw could seize because of chemical crosslinking. There is also some degree of risk of the machine itself becoming damaged.

With plastic injection molding, raw material is on the receiving end of high pressure injection. Again, the material goes into a mold and once cooled takes on the exact shape. Depending on the customer's need, the professionals with Offshore Direct Metals will use a single cavity or multiple cavities. Several cavities can be identical whereas the same part is formed but this can be set up to produce parts of several different shapes for one customer.

Back to Blog ...
Top